tools/opentf/FileType.cs

   1 //
   2 // filetype.cs
   3 //
   4 // Authors:
   5 //      Joel Reed (joelwreed@gmail.com)
   6 //
   7
   8 //
   9 // Permission is hereby granted, free of charge, to any person obtaining
  10 // a copy of this software and associated documentation files (the
  11 // "Software"), to deal in the Software without restriction, including
  12 // without limitation the rights to use, copy, modify, merge, publish,
  13 // distribute, sublicense, and/or sell copies of the Software, and to
  14 // permit persons to whom the Software is furnished to do so, subject to
  15 // the following conditions:
  16 //
  17 // The above copyright notice and this permission notice shall be
  18 // included in all copies or substantial portions of the Software.
  19 //
  20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  27 //
  28
  29 using System;
  30 using System.Collections.Generic;
  31 using System.IO;
  32 using System.Runtime.InteropServices;
  33 using Mono.Unix;
  34
  35 class FileTypeDatabase
  36 {
  37         [DllImport("magic")]
  38         private extern static IntPtr magic_open(int flags);
  39
  40         [DllImport("magic")]
  41         private extern static void magic_close(IntPtr magic_cookie);
  42
  43         [DllImport("magic")]
  44         private extern static IntPtr magic_file(IntPtr magic_cookie, string filename);
  45
  46         [DllImport("magic")]
  47         private extern static int magic_load(IntPtr magic_cookie, IntPtr x);
  48
  49         private static IntPtr _magic = IntPtr.Zero;
  50
  51         static FileTypeDatabase()
  52         {
  53                 _magic = magic_open(0);
  54                 if (_magic == IntPtr.Zero)
  55                         {
  56                                 Console.WriteLine("Warning: failed to open libmagic database");
  57                                 return;
  58                         }
  59
  60                 magic_load(_magic, IntPtr.Zero);
  61         }
  62
  63         ~FileTypeDatabase()
  64         {
  65                 if (_magic != IntPtr.Zero)
  66                         magic_close(_magic);
  67         }
  68
  69         public static bool ShouldBeExecutable(string filename)
  70         {
  71                 if (_magic == IntPtr.Zero) return false;
  72                 string desc = Marshal.PtrToStringAuto(magic_file(_magic, filename));
  73                 if (String.IsNullOrEmpty(desc))
  74                         {
  75                                 Console.WriteLine("Error querying file type for " + filename);
  76                                 return false;
  77                         }
  78
  79                 return desc.Contains("executable");
  80         }
  81
  82         public static void MakeExecutable(string filename)
  83         {
  84                 Mono.Unix.Native.Stat stat;
  85                 if (0 == Mono.Unix.Native.Syscall.stat(filename, out stat))
  86                         {
  87                                 Mono.Unix.Native.FilePermissions fp = stat.st_mode | Mono.Unix.Native.FilePermissions.S_IXUSR;
  88                                 Mono.Unix.Native.Syscall.chmod(filename, fp);
  89                         }
  90         }
  91
  92         public static void SetPermissions(List<string> fileList)
  93         {
  94                 Console.Write("Setting permissions...");
  95
  96                 int i = 0;
  97                 foreach (string file in fileList)
  98                         {
  99                                 if (0 == (i % 100)) Console.Write(".");
 100                                 i++;
 101
 102                                 if (! ShouldBeExecutable(file)) continue;
 103                                 MakeExecutable(file);
 104                         }
 105
 106                 Console.WriteLine(" done!");
 107         }
 108 }
 109